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Share Repurchase Plan - Additional Information (Detail) - $ / shares |  | 1 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2018 | Jun. 30, 2015 | May 31, 2018 | May 31, 2017 | Nov. 30, 2017 | Oct. 06, 2016 | Apr. 08, 2015 | Jun. 06, 2012 | Dec. 31, 2011
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized to repurchase |  |  |  |  |  | 8,000,000 | 6,000,000 | 3,000,000 | 1,000,000
Share repurchase plan |  |  | Open market purchases, privately negotiated block trades, unsolicited negotiated transactions, and/or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Securities and Exchange Commission |  |  |  |  |  |
Tender offer to purchase common stock price per share |  | $ 3.25 |  |  |  |  |  |  |
Percentage of outstanding common shares purchased under tender offer |  | 7.76% |  |  |  |  |  |  |
Tender offer sales price |  | $ 2.29 |  |  |  |  |  |  |
Treasury stock, shares | 5,801,086 |  | 5,801,086 |  | 5,801,086 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Tender offer to purchase common stock shares |  | 750,000 |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Treasury stock, shares | 5,801,086 |  | 5,801,086 |  |  |  |  |  |
Repurchase agreement, purchase price per share | $ 3.37 |  | $ 0.00 | $ 5.05 |  |  |  |  |
Number of shares repurchased |  |  | 0 | 79,942 |  |  |  |  |

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